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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7a1ba216f923bb5dcb224314cc9593ae5d79001590f996e92adde3fedcb3bc4' 
  AND token = 'iFKARLVc5txXt3jGKznWvOY9/rn9s9g2Bbwl6MmURQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}